A bidimensional fluid system with competing interactions: spontaneous and induced pattern formation
Articolo
Data di Pubblicazione:
2004
Citazione:
A bidimensional fluid system with competing interactions: spontaneous and induced pattern formation / A. Imperio, L. Reatto. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 16:38(2004), pp. S3769-S3789.
Abstract:
In this paper we present a study of pattern formation in bidimensional systems with competing short-range attractive and long-range repulsive interactions. The interaction parameters are chosen in such a way as to allow us to analyse two different situations: the spontaneous pattern formation due to the presence of strong competing interactions on different length scales and the pattern formation as a response to an external modulating potential when the system is close to its Lifshitz point. We compare different Monte Carlo techniques showing that the parallel tempering technique represents a promising approach for the study of such systems and we present detailed results for the specific heat and the structural properties. We also present random phase approximation predictions concerning spontaneous pattern formation (or microphase separation), as well as linear response theory predictions concerning the induced pattern formation due to the presence of an external modulating field. In particular we observe that the response of our systems to external fields is much stronger than the response of a Lennard-Jones fluid.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Monte Carlo methods; pattern formation; RPA calculations; specific heat
Elenco autori:
A. Imperio, L. Reatto
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